eitter: octacnemus. 251 



Rectal portion of the intestine projecting considerably beyond the visceral 

 mass, the anus directed backward and upward. 



These specific differences will be rea<lily seen by comparing Figures 1 and 2, 

 Plate 1, with Figures. 2 and 1 respectively, Plate 10, of Herdman'a Report 

 (1888) ; these latter being copies of Moseley's figures. 



Abbreviations. 



a anua. 



ad. adhesive patch. 



at atrial orifice. 



at. c atrial cliamber. 



br branchial orifice. 



br. s branchial stigmata. 



c. b. s cavity of branchial sac. 



d. I dorsal lamina. 



d. t dorsal tuhercle. 



ec ectoderm. 



en endostyle. 



en.f. endostylar fold. 



h. m " horizontal membrane." 



int. b intestinal band. 



m membrane together with the epithelium 



lining the atrial chamber. 



m. b., m. b'., m. b"., muscle bands. 



m. r radial muscles. 



n anterior nerves. 



n. g nerve ganglion. 



n. z nucleated zone. 



n.n.z non-nucleated zone. 



o.br opening into branchial sac by dissection. 



oe. ..... . oesophagus. 



ov ovary. 



p. b. b peripharyngeal band. 



r. n rapheal nerve. 



s. gl subneural gland. 



St. in stomach-intestine. 



t test. 



tes testis. 



v.f. ventral flange. 



